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6#include <linux/clk.h>
7#include <linux/device.h>
8#include <linux/err.h>
9#include <linux/init.h>
10#include <linux/input.h>
11#include <linux/interrupt.h>
12#include <linux/io.h>
13#include <linux/jiffies.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/of_address.h>
18#include <linux/platform_device.h>
19#include <linux/pm_wakeirq.h>
20#include <linux/mfd/syscon.h>
21#include <linux/regmap.h>
22
23#define SNVS_HPVIDR1_REG 0xF8
24#define SNVS_LPSR_REG 0x4C
25#define SNVS_LPCR_REG 0x38
26#define SNVS_HPSR_REG 0x14
27#define SNVS_HPSR_BTN BIT(6)
28#define SNVS_LPSR_SPO BIT(18)
29#define SNVS_LPCR_DEP_EN BIT(5)
30
31#define DEBOUNCE_TIME 30
32#define REPEAT_INTERVAL 60
33
34struct pwrkey_drv_data {
35 struct regmap *snvs;
36 int irq;
37 int keycode;
38 int keystate;
39 int wakeup;
40 struct timer_list check_timer;
41 struct input_dev *input;
42 u8 minor_rev;
43};
44
45static void imx_imx_snvs_check_for_events(struct timer_list *t)
46{
47 struct pwrkey_drv_data *pdata = from_timer(pdata, t, check_timer);
48 struct input_dev *input = pdata->input;
49 u32 state;
50
51 regmap_read(pdata->snvs, SNVS_HPSR_REG, &state);
52 state = state & SNVS_HPSR_BTN ? 1 : 0;
53
54
55 if (state ^ pdata->keystate) {
56 pdata->keystate = state;
57 input_event(input, EV_KEY, pdata->keycode, state);
58 input_sync(input);
59 pm_relax(pdata->input->dev.parent);
60 }
61
62
63 if (state) {
64 mod_timer(&pdata->check_timer,
65 jiffies + msecs_to_jiffies(REPEAT_INTERVAL));
66 }
67}
68
69static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id)
70{
71 struct platform_device *pdev = dev_id;
72 struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
73 struct input_dev *input = pdata->input;
74 u32 lp_status;
75
76 pm_wakeup_event(input->dev.parent, 0);
77
78 regmap_read(pdata->snvs, SNVS_LPSR_REG, &lp_status);
79 if (lp_status & SNVS_LPSR_SPO) {
80 if (pdata->minor_rev == 0) {
81
82
83
84
85
86 input_report_key(input, pdata->keycode, 1);
87 input_sync(input);
88 input_report_key(input, pdata->keycode, 0);
89 input_sync(input);
90 pm_relax(input->dev.parent);
91 } else {
92 mod_timer(&pdata->check_timer,
93 jiffies + msecs_to_jiffies(DEBOUNCE_TIME));
94 }
95 }
96
97
98 regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
99
100 return IRQ_HANDLED;
101}
102
103static void imx_snvs_pwrkey_disable_clk(void *data)
104{
105 clk_disable_unprepare(data);
106}
107
108static void imx_snvs_pwrkey_act(void *pdata)
109{
110 struct pwrkey_drv_data *pd = pdata;
111
112 del_timer_sync(&pd->check_timer);
113}
114
115static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
116{
117 struct pwrkey_drv_data *pdata;
118 struct input_dev *input;
119 struct device_node *np;
120 struct clk *clk;
121 int error;
122 u32 vid;
123
124
125 np = pdev->dev.of_node;
126 if (!np)
127 return -ENODEV;
128
129 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
130 if (!pdata)
131 return -ENOMEM;
132
133 pdata->snvs = syscon_regmap_lookup_by_phandle(np, "regmap");
134 if (IS_ERR(pdata->snvs)) {
135 dev_err(&pdev->dev, "Can't get snvs syscon\n");
136 return PTR_ERR(pdata->snvs);
137 }
138
139 if (of_property_read_u32(np, "linux,keycode", &pdata->keycode)) {
140 pdata->keycode = KEY_POWER;
141 dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
142 }
143
144 clk = devm_clk_get_optional(&pdev->dev, NULL);
145 if (IS_ERR(clk)) {
146 dev_err(&pdev->dev, "Failed to get snvs clock (%pe)\n", clk);
147 return PTR_ERR(clk);
148 }
149
150 error = clk_prepare_enable(clk);
151 if (error) {
152 dev_err(&pdev->dev, "Failed to enable snvs clock (%pe)\n",
153 ERR_PTR(error));
154 return error;
155 }
156
157 error = devm_add_action_or_reset(&pdev->dev,
158 imx_snvs_pwrkey_disable_clk, clk);
159 if (error) {
160 dev_err(&pdev->dev,
161 "Failed to register clock cleanup handler (%pe)\n",
162 ERR_PTR(error));
163 return error;
164 }
165
166 pdata->wakeup = of_property_read_bool(np, "wakeup-source");
167
168 pdata->irq = platform_get_irq(pdev, 0);
169 if (pdata->irq < 0)
170 return -EINVAL;
171
172 regmap_read(pdata->snvs, SNVS_HPVIDR1_REG, &vid);
173 pdata->minor_rev = vid & 0xff;
174
175 regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN);
176
177
178 regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
179
180 timer_setup(&pdata->check_timer, imx_imx_snvs_check_for_events, 0);
181
182 input = devm_input_allocate_device(&pdev->dev);
183 if (!input) {
184 dev_err(&pdev->dev, "failed to allocate the input device\n");
185 return -ENOMEM;
186 }
187
188 input->name = pdev->name;
189 input->phys = "snvs-pwrkey/input0";
190 input->id.bustype = BUS_HOST;
191
192 input_set_capability(input, EV_KEY, pdata->keycode);
193
194
195 error = devm_add_action(&pdev->dev, imx_snvs_pwrkey_act, pdata);
196 if (error) {
197 dev_err(&pdev->dev, "failed to register remove action\n");
198 return error;
199 }
200
201 pdata->input = input;
202 platform_set_drvdata(pdev, pdata);
203
204 error = devm_request_irq(&pdev->dev, pdata->irq,
205 imx_snvs_pwrkey_interrupt,
206 0, pdev->name, pdev);
207
208 if (error) {
209 dev_err(&pdev->dev, "interrupt not available.\n");
210 return error;
211 }
212
213 error = input_register_device(input);
214 if (error < 0) {
215 dev_err(&pdev->dev, "failed to register input device\n");
216 return error;
217 }
218
219 device_init_wakeup(&pdev->dev, pdata->wakeup);
220 error = dev_pm_set_wake_irq(&pdev->dev, pdata->irq);
221 if (error)
222 dev_err(&pdev->dev, "irq wake enable failed.\n");
223
224 return 0;
225}
226
227static const struct of_device_id imx_snvs_pwrkey_ids[] = {
228 { .compatible = "fsl,sec-v4.0-pwrkey" },
229 { }
230};
231MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids);
232
233static struct platform_driver imx_snvs_pwrkey_driver = {
234 .driver = {
235 .name = "snvs_pwrkey",
236 .of_match_table = imx_snvs_pwrkey_ids,
237 },
238 .probe = imx_snvs_pwrkey_probe,
239};
240module_platform_driver(imx_snvs_pwrkey_driver);
241
242MODULE_AUTHOR("Freescale Semiconductor");
243MODULE_DESCRIPTION("i.MX snvs power key Driver");
244MODULE_LICENSE("GPL");
245
